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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2016.0584
Security Bulletin: Vulnerabilities in OpenSSL affect AIX
(CVE-2015-3197 CVE-2015-4000)
4 March 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: OpenSSL
Publisher: IBM
Operating System: AIX
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-4000 CVE-2015-3197
Reference: ASB-2016.0004
ESB-2016.0569
ESB-2016.0544
ESB-2016.0543
ESB-2016.0479
ESB-2016.0476
ASB-2015.0103
ASB-2015.0070
ASB-2015.0066
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc
- --------------------------BEGIN INCLUDED TEXT--------------------
IBM SECURITY ADVISORY
First Issued: Wed Mar 2 08:43:07 CST 2016
The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc
Security Bulletin: Vulnerabilities in OpenSSL affect AIX
CVE-2015-3197 CVE-2015-4000
===============================================================================
SUMMARY:
OpenSSL vulnerabilities were disclosed on January 28, 2016 by the OpenSSL
Project. OpenSSL is used by AIX. AIX has addressed the applicable CVEs.
===============================================================================
VULNERABILITY DETAILS:
CVEID: CVE-2015-3197
DESCRIPTION: A malicious client can negotiate SSLv2 ciphers that have been
disabled on the server and complete SSLv2 handshakes even if all SSLv2
ciphers have been disabled, provided that the SSLv2 protocol was not
disabled via SSL_OP_NO_SSLv2.
CVSS Base Score: 5.4
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/110235 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)
CVEID: CVE-2015-4000
DESCRIPTION: A previously published vulnerability in the TLS protocol
allows a man-in-the-middle attacker to downgrade vulnerable TLS
connections using ephemeral Diffie-Hellman key exchange to 512-bit
export-grade cryptography. This vulnerability is known as 'Logjam'.
AIX OpenSSL had the Logjam mitigation for TLS clients by rejecting
handshakes with DH parameters shorter than 768 bits. This limit has
now been increased to 1024 bits.
CVSS Base Score: 4.3
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/103294 for the
current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:N/I:P/A:N)
AFFECTED PRODUCTS AND VERSIONS:
AIX 5.3, 6.1, 7.1, 7.2
VIOS 2.2.x
The following fileset levels are vulnerable:
key_fileset = osrcaix
Fileset Lower Level Upper Level KEY
--------------------------------------------------
openssl.base 0.9.8.401 0.9.8.2506 key_w_fs
openssl.base 1.0.1.500 1.0.1.515 key_w_fs
openssl.base 12.9.8.1100 12.9.8.2506 key_w_fs
Note: to find out whether the affected filesets are installed
on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i openssl.base
REMEDIATION:
A. FIXES
Fixes are available.
The fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/openssl_fix17.tar
http://aix.software.ibm.com/aix/efixes/security/openssl_fix17.tar
https://aix.software.ibm.com/aix/efixes/security/openssl_fix17.tar
The link above is to a tar file containing this signed
advisory, fix packages, and OpenSSL signatures for each package.
The fixes below include prerequisite checking. This will
enforce the correct mapping between the fixes and AIX
Technology Levels.
Note that the tar file contains Interim fixes that are based on
OpenSSL version, and AIX OpenSSL fixes are cumulative.
AIX Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY
--------------------------------------------------------------------------------------------
5.3, 6.1, 7.1, 7.2 IV81287m9b.160217.epkg.Z openssl.base(0.9.8.2506) key_w_fix
5.3, 6.1, 7.1, 7.2 IV81287m9a.160217.epkg.Z openssl.base(1.0.1.515) key_w_fix
5.3, 6.1, 7.1, 7.2 IV81287m9c.160217.epkg.Z openssl.base(12.9.8.2506) key_w_fix
VIOS Level Interim Fix (*.Z) Fileset Name(prereq for installation) KEY
--------------------------------------------------------------------------------------------
2.2.* IV81287m9b.160217.epkg.Z openssl.base(0.9.8.2506) key_w_fix
2.2.* IV81287m9a.160217.epkg.Z openssl.base(1.0.1.515) key_w_fix
2.2.* IV81287m9c.160217.epkg.Z openssl.base(12.9.8.2506) key_w_fix
To extract the fixes from the tar file:
tar xvf openssl_fix17.tar
cd openssl_fix17
Verify you have retrieved the fixes intact:
The checksums below were generated using the
"openssl dgst -sha256 file" command as the followng:
openssl dgst -sha256 filename KEY
------------------------------------------------------------------------------------------------------
55d799969cca782bd66f362cf5683d5106e86884a4519d69a2ce65d2ae6de274 IV81287m9b.160217.epkg.Z key_w_csum
09658192c5f10636a43201c245da652083770a6e98c83d0922032b6b8938eb97 IV81287m9a.160217.epkg.Z key_w_csum
00b632cb9c4433e40f35e9db148051ca01944d111006ee5c5b94d8f237909220 IV81287m9c.160217.epkg.Z key_w_csum
These sums should match exactly. The OpenSSL signatures in the tar
file and on this advisory can also be used to verify the
integrity of the fixes. If the sums or signatures cannot be
confirmed, contact IBM AIX Security at
security-alert@austin.ibm.com and describe the discrepancy.
openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>
openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc.sig
https://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/openssl_advisory17.asc.sig
B. FIX AND INTERIM FIX INSTALLATION
IMPORTANT: If possible, it is recommended that a mksysb backup
of the system be created. Verify it is both bootable and
readable before proceeding.
To preview a fix installation:
installp -a -d fix_name -p all # where fix_name is the name of the
# fix package being previewed.
To install a fix package:
installp -a -d fix_name -X all # where fix_name is the name of the
# fix package being installed.
Interim fixes have had limited functional and regression
testing but not the full regression testing that takes place
for Service Packs; however, IBM does fully support them.
Interim fix management documentation can be found at:
http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html
To preview an interim fix installation:
emgr -e ipkg_name -p # where ipkg_name is the name of the
# interim fix package being previewed.
To install an interim fix package:
emgr -e ipkg_name -X # where ipkg_name is the name of the
# interim fix package being installed.
WORKAROUNDS AND MITIGATIONS:
None.
===============================================================================
CONTACT US:
Note: Keywords labeled as KEY in this document are used for parsing
purposes.
If you would like to receive AIX Security Advisories via email,
please visit "My Notifications":
http://www.ibm.com/support/mynotifications
To view previously issued advisories, please visit:
http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq
Comments regarding the content of this announcement can be
directed to:
security-alert@austin.ibm.com
To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:
Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt
To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team via security-alert@austin.ibm.com you
can either:
A. Download the key from our web page:
http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
B. Download the key from a PGP Public Key Server. The key ID is:
0x28BFAA12
Please contact your local IBM AIX support center for any
assistance.
REFERENCES:
Complete CVSS v2 Guide: http://www.first.org/cvss/v2/guide
On-line Calculator v2: http://nvd.nist.gov/CVSS-v2-Calculator
Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide
On-line Calculator v3: http://www.first.org/cvss/calculator/3.0
ACKNOWLEDGEMENTS:
None.
CHANGE HISTORY:
First Issued: Wed Mar 2 08:43:07 CST 2016
===============================================================================
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact
of this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
- --------------------------END INCLUDED TEXT--------------------
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